Rainbow-electronics Atmega169L Manuel d'utilisateur télécharger pdf (Page 245)

245

ATmega169V/L

2514A–AVR–08/02

ATmega169 Boundary-

scan Order

Table 107 shows the Scan order between TDI and TDO when the Boundary-scan chain

is selected as data path. Bit 0 is the LSB; the first bit scanned in, and the first bit

scanned out. The scan order follows the pin-out order as far as possible. Therefore, the

bits of Port A is scanned in the opposite bit order of the other ports. Exceptions from the

rules are the Scan chains for the analog circuits, which constitute the most significant

bits of the scan chain regardless of which physical pin they are connected to. In Figure

108, PXn. Data corresponds to FF0, PXn. Control corresponds to FF1, and PXn.

Pullup_enable corresponds to FF2. Bit 2, 3, 4, and 5 of Port C is not in the scan chain,

since these pins constitute the TAP pins when the JTAG is enabled.

Table 107. ATmega169 Boundary-scan Order

Bit Number Signal Name Module

197 AC_IDLE Comparator

196 ACO

195 ACME

194 AINBG

193 COMP ADC

192 ACLK

191 ACTEN

190 ADHSM

189 ADCBGEN

188 ADCEN

187 AMPEN

186 DAC_9

185 DAC_8

184 DAC_7

183 DAC_6

182 DAC_5

181 DAC_4

180 DAC_3

179 DAC_2

178 DAC_1

177 DAC_0

176 EXTCH

175 GNDEN

174 HOLD

173 IREFEN

172 MUXEN_7

171 MUXEN_6

170 MUXEN_5

169 MUXEN_4

1 2 ... 240 241 242 243 244 245 246 247 248 249 250 ... 316 317

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Rainbow-electronics Atmega169L Manuel d'utilisateur Page 245

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